On the internet, I found the blog of Gordon Lewis:
Shutterfinger: Candid Photography
He writes a little about the Pentax 6x7 as a camera for street photography. I like
this camera for street shots, and I wonder whether I'm the only one here, or if
there are others with this passion??
Here is the quote from Lewis' blog:
Quote: At the opposite extreme in size though similar in simplicity was the Pentax 67 I
owned when I was in my late-twenties. The Pentax 67 took 120 rollfim, produced
a 6x7cm image and looked like a 35mm SLR on steroids. Because the reflex mirror
and shutter were so large, the noise and vibration were alarming, to say the l
least. Most Pentax 67 afficionados mounted it to a heavy tripod and used mirror
lock-up to ensure vibration-free photos. That's certainly what I did when I used it
for interior photography. I skipped the mirror lock-up for portraiture.
Common sense would dictate that the Pentax 67 would be one of the worst
possible choices for street photography--and yet it was one of the best street
cameras I ever owned. Was it small? No. Was it quiet? Hardly. I therefore had to
abandon all pretense of being discrete. Instead, I had to get comfortable with
walking around in public places with a huge conversation-starter. People took it
for granted that I was "serious" and that if I pointed it in their direction it was for
good reason. Most were flattered. Attractive women asked for my card. Men
looked with envy at the size of my lenses. The lesson-learned was that it was up
to me to decide what camera was most appropriate for my needs, not tradition,
popular opinion or accepted wisdom.